When I render, it just shows the render and it says it's finished, but there's nothing there
Overview:


  First of all, I don't know anything about Video Editing in Blender.


First option:

It seems that you have some Strip (4.) added to the project and this is blocking/muting rendering.


Go to Video Editing.
Select Strip (if you see transparent render result hit ESC).
Erase Strips.


Or modify it accordingly to your project.



Second option:

If you don't use VSE at all and made this Strip by accident you can always turn of Sequencer completely: